Public health policies must continue to focus on prevention, especially among kids.

At the national level, First Lady Michelle Obama has fought hard to combat childhood obesity by launching the Let’s Move! campaign. She has appeared on Sesame Street and on late-night television numerous times to convince people of all ages to be active and to make healthful eating choices.

Here she is with Big Bird in the White House kitchen:

And here’s a hilarious (and highly effective) video encouraging Americans to be active, featuring the First Lady and “Tonight Show” host Jimmy Fallon in a segment called “Evolution of Mom Dancing”:

Obama makes exercise look fun and hip, but for many Americans— changing behavior is incredibly difficult.

Though this New York Times news story highlights a promising 43 percent drop in obesity among 2 and 5-year-old children over the last ten years, the CDC reported no significant reductions among other groups during that same period.